fix: check element type in different environments #552
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Add a helper to verify the element type in different environments.
What:
Add a helper to utils.
This can be removed from this library and replaced by a shared helper in
@testing-library/dom
once it is bumped to a version that includes testing-library/dom-testing-library#885.Why:
See #550
How:
The helper tries to find the element constructor on the window.
As the window is neither required to be associated with the observed document nor is it required to provide any element constructors, the helper provides a fallback for other environments than Jest+JSDOM.
Checklist: